Need help creating model.

I have the following in my Student model. I am wanting to track the
date of each point given to each student. The idea would be so that I
could see not only how many points each student has, but also see the
date each point was given. In the future I want to see the trend of
each students' points. How should I go about this? Should I use a
Foreign Key in another class. I am new to this so thanks for reading.

class Student(models.Model):

CLASS_CHOICES = (
(u'Yoga','Yoga'),
(u'Spanish', 'Spanish'),
(u'French', 'French'),
(u'Dance', 'Dance'),
)

name = models.CharField(max_length=30)
points = models.IntegerField(max_length=4)
classname = models.CharField("Class Name",max_length=20, choices =
CLASS_CHOICES)

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